MGEA5-14 polymorphism and type 2 diabetes in Mexico City

Area of Science:

• Genetics
• Metabolic Diseases
• Population Studies

Background:

• A previous family-based study suggested a MGEA5 gene variant in intron 10 is associated with increased Type 2 Diabetes (T2D) susceptibility.
• The MGEA5 gene's role in T2D pathogenesis requires further investigation across diverse populations.

Purpose of the Study:

• To evaluate the frequency of the MGEA5-rsXXXXXX single nucleotide polymorphism (SNP) in a Mexican population with Type 2 Diabetes.
• To compare the SNP's distribution in Mexican cases and controls with European, West African, and Native American populations.

Main Methods:

• Genotyping of the MGEA5-rsXXXXXX SNP in 271 T2D patients and 244 controls from Mexico City.
• Analysis of SNP distribution in European (Spain), European American, West African, and Native American (Mexico, Peru) ancestral populations.

Main Results:

• The T-allele frequency was slightly higher in Mexican T2D cases (2.6%) than controls (1.8%), but this difference was not statistically significant after adjustments (OR=1.60, 95% CI: 0.52-4.86, P=0.404).
• The T-allele was present in European (2.3%), European American (4.2%), and West African (13%) samples, but absent in Native American samples from Mexico and Peru.

Conclusions:

• The MGEA5-rsXXXXXX variant's low frequency in the Mexican population and Native Americans limits its potential role in T2D in these groups.
• Larger sample sizes are necessary to definitively confirm or refute the association between this MGEA5 variant and Type 2 Diabetes risk.